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DxO 10.5: when I export an image in its original size, the JPEG looks fine. If I export it at a smaller size, like downsampling to a size of 2048 px on the longest side, the JPEG looks 'too sharp'.

I don't know if it is too much micro contrast added or too much sharpening, but the end results looks like it has been processed by some cheap filter. I have tried all kinds of setting: auto, bicubic. The result is the same.

If I downsample the original size jpeg in Aperture to the same 2048px dimension, it looks fine.

The sharpening in DoP called 'Interpolation'. You can choose the algorithm before Export. Please have a look on the attached Sharpening.jpg'. The strongest for small size images is Bicubic sharper. Play with the options to find the best for you.

Right .. bug in the machine somehow. I created a new export option, with the same settings to play with it and at exactly the same setting it produces a better image, like the one I export when downsizing in Aperture.

The export setting has been there for some several versions of DxO and I suspect it did get corrupted or is interpreted differently when it has moved along with DxO version upgrades.

Let this be a gentle reminder to reset your preferred export options you created yourself with upgrades